linux中tr命令使用解析.docx

tr命令相关选项：?tr-转换或删除字符?常用选项：?-c:取字符集的补集?-d:删除匹配的指定字符集中的字符?-s:把连续重复的字符以单独一个字符表示?-t:先删除第一字符集较第二字符集多出的字符?\\：反斜杠?\a：响铃?\b：退格?\n：换行 ?\r：回车 [:alnum:]?：所有的字母和数字?[:alpha:]?：所有的字母?[:blank:]?：所有呈水平排列的空白字符??[:cntrl:]?：所有的控制字符 [:digit:]：?所有的数字?[:graph:]?：所有的可打印字符，不包括空格?[:lower:]?：所有的小写字母??[:print:]?：所有的可打印字符，包括空格 [:punct:]?：所有的标点字符 [:space:]?：所有呈水平或垂直排列的空白字符?[:upper:]?：所有的大写字母tr相关练习题：?1、将/etc/issue文件中的内容转换为大写后保存至/tmp/issue.out文件中?123456789101112131415?[root@localhost?test]#?cat?/etc/issue?CentOS?release?6.8?(Final)?Kernel?\r?on?an?\m???Mage?Education?Learning?Services????[root@localhost?test]#?cat?/etc/issue|tr?a-z?A-Z??/tmp/issue.out?[root@localhost?test]#?cat?/tmp/issue.out??CENTOS?RELEASE?6.8?(FINAL)?KERNEL?\R?ON?AN?\M?MAGE?EDUCATION?LEARNING?SERVICES?HTTP://WWW.MAGEDU.COM???[root@localhost?test]#2、将当前系统登录用户的信息转换为大写后保存至/tmp/who.out文件[root@localhost?test]#?who?rootpts/0?2016-07-31?17:08?(8)?rootpts/1?2016-07-31?17:54?(8)?[root@localhost?test]#?who|tr?a-z?A-Z??/tmp/who.out?[root@localhost?test]#?cat?/tmp/who.out??ROOT?????PTS/0?2016-07-31?17:08?(8)?ROOT?????PTS/1?2016-07-31?17:54?(8)?[root@localhost?test]#3、一个linux用户给root发邮件，要求邮件标题为”help”，邮件正文如下：Hello, I am 用户名,the system version is here,pleasehelp me to check it ,thanks!操作系统版本信息?123456789101112131415161718192021222324user?send?message：?[doodle@localhost?~]$?echo?-e?Hello,?I?am?`whoami`,the?system?version?is?`uname?-a`,pleasehelp?me?to?check?it?,thanks\!|mail?-s?help?root?[doodle@localhost?~]$root?receive:?[root@localhost?~]#?mail?Heirloom?Mail?version?12.4?7/29/08.??Type???for?help.?/var/spool/mail/root:?2?messages?1?new?1?doodle@localhost.loc??Sun?Jul?31?19:52??19/801?help?N??2?doodle@localhost.loc??Sun?Jul?31?20:50??18/790?help???Message??2:?From?doodle@localhost.localdomain?Sun?Jul?31?20:50:18?2016?Return-Path:?doodle@localhost.localdomain?X-Original-To:?root?Delivered-To:?root@localhost.localdomain?Date:?Sun,?31?Jul?2016?20:50:18?+0800?To:?root@localhost.localdomain?Subject:?help?User-Agent:?Heirloom?mailx?12.4?7/